🐞 Bug: headers option does not set custom HTTP headers

[liAmirali]

Description

According to the plugin documentation, the headers option should allow adding additional HTTP headers to outgoing requests. However, setting this option has no effect — no custom headers are added, and the debug logs do not appear with --header arguments being passed to sentry-cli.

Environment

@sentry/webpack-plugin vesion: 4.1.1
Framework: Vue 2 (via @vue/cli-service)
Node version: v24.5.0

Steps to Reproduce

1. Add a headers option in the plugin config.
2. Run a build with debug: true. Preferably set the SENTRY_LOG_LEVEL to debug
3. Observe that the header is not present in debug logs and not sent in requests.

Expected Result

• Custom headers (e.g., x-identifier) should be forwarded to sentry-cli and included in upload requests.
• The debug logs should reflect the --header flags.

Observed Behavior

• The debug logs show the command executed by the plugin and some --header is included.
• But no custom headers (those which are set in the headers option) are sent with the request.

Actual Result

  INFO    2025-08-28 15:49:52.439394471 +03:30 sentry-cli was invoked with the following command line: ".../sentry-javascript-bundler-plugins/node_modules/@sentry/cli-linux-x64/bin/sentry-cli" "--header" "sentry-trace:xxxxxxx" "--header" "baggage:sentry-environment=production,sentry-release=4.1.1,sentry-public_key=xxxxx,sentry-trace_id=xxxxx,sentry-sample_rate=1,sentry-transaction=debug-id-sourcemap-upload,sentry-sampled=true" "--header" "sourcemaps" "upload" "--release" "xxxxx" "/tmp/sentry-bundler-plugin-upload-NEOt49" "--ignore" "node_modules" "--dist" "xxxxx" "--no-rewrite"

Workaround

Currently, the only workaround is to disable source map uploads in the plugin and run sentry-cli releases files upload-sourcemaps manually with --header.

[linear]

BUNDLER-81 🐞 Bug: headers option does not set custom HTTP headers